Speaker History records are structured around a major category (Cnn), a type (sub-category, Ynn) and then a level (Lnn), followed by start (Bnn) and end years (Enn) for each recorded event. These may be interpreted using the following table.
| Category | Type | Level |
|---|---|---|
| singing | type | hours / week |
| medical | condition | severity |
| residence | place | not used |
| music | type | hours/week |
| occupation | task | hours/week |
| voice_training | task | hours/week |
| language | name | 1 = not fluent 2 = moderately fluent 3 = fluent |
| education | level | not used (may contain institution name) |
| smoking | type | number or hours/week |
| sport | type | hours/week |
| vocal_stress | type | hours / week |
NOTE: The start year (Bnn) and end year (Enn) are given as a four digit year > 1000.
If Bnn = 0 or blank and Enn < 1000 then Enn = the number of years